Before moving to the Trivial Torrent implementation itself. You need to do a very small project that it is not related to the main project, but that will help you to familiarize yourself with the POSIX sockets API and the build environment.
Write a UDP server employing the POSIX sockets API that waits for datagrams to arrive and, for each one received, responds with another datagram addressed to the original sender and the data contents of the original datagram. The server must reply to 3 datagrams and then quit.
Use the file src/pong.c.
Use the logging API in src/logger.h.
Use the POSIX specification in https://pubs.opengroup.org/onlinepubs/9699919799/.
Use make in a terminal to build your project.
$ make
This will create the executable file bin/pong.
For your convenience, a reference binary is provided in the reference_binary directory.
The server can be tested by employing the command line tool netcat (see man netcat).
In one terminal run the pong server:
$ bin/pong
In another terminal connect to the pong server with netcat:
$ netcat -u 127.0.0.1 8080
You should be able to see that each line you write is repeated back to you. This should happen exactly three times.
Additional tests may be run with:
$ make test
Note that github runs make test for you every time you push something to this repository. You can see the results in the Actions tab.